Remove prints

This close #108 and adds a rule to the analyzer that this problems
can no longer occur.

Also, remove unnecessary catches and catches where the exceptions
occur in the user code and therefore should be handled by the user
instead of being swallowed by this library.

analysis_options.yaml

@@ -5,3 +5,6 @@ analyzer:
     undefined_prefixed_name: ignore
     omit_local_variable_types: ignore
     unsafe_html: ignore
+linter:
+  rules:
+    - avoid_print

lib/models/rules/rule.dart

@@ -61,7 +61,6 @@ class Rules {
         final result = rule.apply(delta, index,
             len: len, data: data, attribute: attribute);
         if (result != null) {
-          print('Rule $rule applied');
           return result..trim();
         }
       } catch (e) {

lib/widgets/controller.dart

@@ -78,12 +78,7 @@ class QuillController extends ChangeNotifier {
 
     Delta? delta;
     if (len > 0 || data is! String || data.isNotEmpty) {
-      try {
-        delta = document.replace(index, len, data);
-      } catch (e) {
-        print('document.replace failed: $e');
-        rethrow;
-      }
+      delta = document.replace(index, len, data);
       bool shouldRetainDelta = toggledStyle.isNotEmpty &&
           delta.isNotEmpty &&
           delta.length <= 2 &&
@@ -112,23 +107,18 @@ class QuillController extends ChangeNotifier {
       if (delta == null || delta.isEmpty) {
         _updateSelection(textSelection, ChangeSource.LOCAL);
       } else {
-        try {
-          Delta user = Delta()
-            ..retain(index)
-            ..insert(data)
-            ..delete(len);
-          int positionDelta = getPositionDelta(user, delta);
-          _updateSelection(
-            textSelection.copyWith(
-              baseOffset: textSelection.baseOffset + positionDelta,
-              extentOffset: textSelection.extentOffset + positionDelta,
-            ),
-            ChangeSource.LOCAL,
-          );
-        } catch (e) {
-          print('getPositionDelta or getPositionDelta error: $e');
-          rethrow;
-        }
+        Delta user = Delta()
+          ..retain(index)
+          ..insert(data)
+          ..delete(len);
+        int positionDelta = getPositionDelta(user, delta);
+        _updateSelection(
+          textSelection.copyWith(
+            baseOffset: textSelection.baseOffset + positionDelta,
+            extentOffset: textSelection.extentOffset + positionDelta,
+          ),
+          ChangeSource.LOCAL,
+        );
       }
     }
     notifyListeners();

lib/widgets/toolbar.dart

@@ -4,7 +4,6 @@ import 'package:file_picker/file_picker.dart';
 import 'package:filesystem_picker/filesystem_picker.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:flutter_colorpicker/flutter_colorpicker.dart';
 import 'package:flutter_quill/models/documents/attribute.dart';
 import 'package:flutter_quill/models/documents/nodes/embed.dart';
@@ -520,46 +519,25 @@ class _ImageButtonState extends State<ImageButton> {
 
     final File file = File(pickedFile.path);
 
-    // We simply return the absolute path to selected file.
-    try {
-      String url = await widget.onImagePickCallback!(file);
-      print('Image uploaded and its url is $url');
-      return url;
-    } catch (error) {
-      print('Upload image error $error');
-    }
-    return null;
+    return widget.onImagePickCallback!(file);
   }
 
   Future<String?> _pickImageWeb() async {
-    try {
-      _paths = (await FilePicker.platform.pickFiles(
-        type: _pickingType,
-        allowMultiple: false,
-        allowedExtensions: (_extension?.isNotEmpty ?? false)
-            ? _extension?.replaceAll(' ', '').split(',')
-            : null,
-      ))
-          ?.files;
-    } on PlatformException catch (e) {
-      print('Unsupported operation' + e.toString());
-    } catch (ex) {
-      print(ex);
-    }
+    _paths = (await FilePicker.platform.pickFiles(
+      type: _pickingType,
+      allowMultiple: false,
+      allowedExtensions: (_extension?.isNotEmpty ?? false)
+          ? _extension?.replaceAll(' ', '').split(',')
+          : null,
+    ))
+        ?.files;
     var _fileName =
         _paths != null ? _paths!.map((e) => e.name).toString() : '...';
 
     if (_paths != null) {
       File file = File(_fileName);
       // We simply return the absolute path to selected file.
-      try {
-        String url = await widget.onImagePickCallback!(file);
-        print('Image uploaded and its url is $url');
-        return url;
-      } catch (error) {
-        print('Upload image error $error');
-      }
-      return null;
+      return widget.onImagePickCallback!(file);
     } else {
       // User canceled the picker
     }
@@ -567,23 +545,16 @@ class _ImageButtonState extends State<ImageButton> {
   }
 
   Future<String> _pickImageDesktop() async {
-    try {
-      var filePath = await FilesystemPicker.open(
-        context: context,
-        rootDirectory: await getApplicationDocumentsDirectory(),
-        fsType: FilesystemType.file,
-        fileTileSelectMode: FileTileSelectMode.wholeTile,
-      );
-      if (filePath != null && filePath.isEmpty) return '';
-
-      final File file = File(filePath!);
-      String url = await widget.onImagePickCallback!(file);
-      print('Image uploaded and its url is $url');
-      return url;
-    } catch (error) {
-      print('Upload image error $error');
-    }
-    return '';
+    var filePath = await FilesystemPicker.open(
+      context: context,
+      rootDirectory: await getApplicationDocumentsDirectory(),
+      fsType: FilesystemType.file,
+      fileTileSelectMode: FileTileSelectMode.wholeTile,
+    );
+    if (filePath != null && filePath.isEmpty) return '';
+
+    final File file = File(filePath!);
+    return widget.onImagePickCallback!(file);
   }
 
   @override