feat: Add spell checking

Fix #1301

Spell checking implemented by KF5Sonnet

CMakeLists.txt

@@ -12,6 +12,7 @@ option(USE_FILTERAUDIO "Enable the echo canceling backend" ON)
 # AUTOUPDATE is currently broken and thus disabled
 option(AUTOUPDATE "Enable the auto updater" OFF)
 option(USE_CCACHE "Use ccache when available" ON)
+option(SPELL_CHECK "Enable spell cheching support" ON)
 
 if(NOT CMAKE_BUILD_TYPE)
   set(CMAKE_BUILD_TYPE Debug)

cmake/Dependencies.cmake

@@ -112,6 +112,16 @@ search_dependency(LIBSWSCALE          PACKAGE libswscale)
 search_dependency(SQLCIPHER           PACKAGE sqlcipher)
 search_dependency(VPX                 PACKAGE vpx)
 
+if(${SPELL_CHECK})
+    find_package(KF5Sonnet)
+    if(KF5Sonnet_FOUND)
+      add_definitions(-DSPELL_CHECKING)
+      add_dependency(KF5::SonnetUi)
+    else()
+      message(WARNING "Sonnet not found. Spell checking will be disabled.")
+    endif()
+endif()
+
 # Try to find cmake toxcore libraries
 if(WIN32)
   search_dependency(TOXCORE             PACKAGE toxcore          OPTIONAL STATIC_PACKAGE)

src/widget/form/genericchatform.cpp

@@ -46,6 +46,10 @@
 #include <QKeyEvent>
 #include <QMessageBox>
 
+#ifdef SPELL_CHECKING
+#include <KF5/SonnetUi/sonnet/spellcheckdecorator.h>
+#endif
+
 /**
  * @class GenericChatForm
  * @brief Parent class for all chatforms. It's provide the minimum required UI
@@ -142,6 +146,9 @@ GenericChatForm::GenericChatForm(const Contact* contact, QWidget* parent)
     connect(&s, &Settings::chatMessageFontChanged, this, &GenericChatForm::onChatMessageFontChanged);
 
     msgEdit = new ChatTextEdit();
+#ifdef SPELL_CHECKING
+    decorator = new Sonnet::SpellCheckDecorator(msgEdit);
+#endif
 
     sendButton = createButton("sendButton", this, &GenericChatForm::onSendTriggered);
     emoteButton = createButton("emoteButton", this, &GenericChatForm::onEmoteButtonClicked);

src/widget/form/genericchatform.h

@@ -54,6 +54,12 @@ namespace Ui {
 class MainWindow;
 }
 
+#ifdef SPELL_CHECKING
+namespace Sonnet {
+class SpellCheckDecorator;
+}
+#endif
+
 class GenericChatForm : public QWidget
 {
     Q_OBJECT
@@ -166,6 +172,9 @@ protected:
     SearchForm *searchForm;
     ChatLog* chatWidget;
     ChatTextEdit* msgEdit;
+#ifdef SPELL_CHECKING
+    Sonnet::SpellCheckDecorator* decorator{nullptr};
+#endif
     FlyoutOverlayWidget* fileFlyout;
     GenericNetCamView* netcam;
     Widget* parent;