NC/Optimisations and bug fixes for objects editing (#1600)

* Optimise undo/redo for thickness, do not save every change on mouse wheel, save just the result

(cherry picked from commit c0bd74790e086dcde1c242a31e27f992a04c07e2)

* fix - In some cases undo/redo stack has excess steps (root cause is in the start move object event on a small not noticeable mouse move)

(cherry picked from commit 912f39f38083e368979f34ef14821979c34482bb)

* fix - It is impossible to remove an object using the "Undo the latest modification" button on second attempt (full undo, draw something, full undo again)

(cherry picked from commit a7f77a130a497ac6fdecd59eb43c889dcc6cbe1a)

* fix - Picked font family in the text editing tool is applied to the autoincrement tool

(cherry picked from commit 11c5eb29b1078bd6aba91fe7a74c2682767ad47c)

* Add git hash to version in the about dialog

(cherry picked from commit b4dbf52b3217b51614100bd307046772a37dc484)

* Add configuration option to limit undo steps

(cherry picked from commit f13cbecabb172060b196a535348f145457ad2f0f)

* Object delete operation is not registered on the undo stack

(cherry picked from commit 5c966cb5d3702a4d735dd542ad03a80899250b4a)

* fix - Unable to draw an object from second attempt after ColorPicker was called

(cherry picked from commit 49a119886fec253376703e8aa2386e16bc23cbcf)

* fix - App freezes and then crashes when changing object line thickness via Active thickness slider in the tool settings

(cherry picked from commit 26fd64f1c333f70c67282630362cbc5fc8427a39)

* fix - set min and max values for thickness slider to 1-100

(cherry picked from commit 6d8661666e4e199a3c29f991d52bef73ec36129c)

* fix - Crash on Move Tool button with an active Text editor

(cherry picked from commit 461f95da3afda56c0e9693e768e86b18d056eecc)

* fix - Text is not modified when picking it as object in the list

(cherry picked from commit 366bb0928b430d442dc67299353f7dc5ceb743b4)

* fix - Text modification cannot be undone
fix - Object that was created after the text object disappears after undo editing text

(cherry picked from commit 79b2fb92aca65b177cffb386db141d30551a2b1c)

* fix - Text is not saved if picking any object in the objects list without clicking at the empty space

(cherry picked from commit 4679a744a3d2498fe27379f89d48b347a34ae0dc)

* Last available undo step reset everything to the beginning

(cherry picked from commit 4af7423d00cfaa9feabc905400aa3ac30fc4a3ea)

* Missed changes (cherry-pick) for switching ColorPicker behaviour (right mouse click and hold to right mouse click and left click)

Co-authored-by: Yuriy Puchkov <yuriy.puchkov@namecheap.com>

src/config/generalconf.cpp

@@ -19,6 +19,7 @@
 GeneralConf::GeneralConf(QWidget* parent)
   : QWidget(parent)
   , m_historyConfirmationToDelete(nullptr)
+  , m_undoLimit(nullptr)
 {
     m_layout = new QVBoxLayout(this);
     m_layout->setAlignment(Qt::AlignTop);
@@ -35,6 +36,7 @@ GeneralConf::GeneralConf(QWidget* parent)
     initUseJpgForClipboard();
     initSaveAfterCopy();
     initUploadHistoryMaxSize();
+    initUndoLimit();
 
     // this has to be at the end
     initConfigButtons();
@@ -54,6 +56,7 @@ void GeneralConf::updateComponents()
     m_copyPathAfterSave->setChecked(config.copyPathAfterSaveEnabled());
     m_useJpgForClipboard->setChecked(config.useJpgForClipboard());
     m_uploadHistoryMaxSize->setValue(config.uploadHistoryMaxSizeValue());
+    m_undoLimit->setValue(config.undoLimit());
 
     if (!config.savePath().isEmpty()) {
         m_savePath->setText(config.savePath());
@@ -182,6 +185,7 @@ void GeneralConf::setActualFormData()
     m_historyConfirmationToDelete->setChecked(
       config.historyConfirmationToDelete());
     m_uploadHistoryMaxSize->setValue(config.uploadHistoryMaxSizeValue());
+    m_undoLimit->setValue(config.undoLimit());
     m_useJpgForClipboard->setChecked(config.useJpgForClipboard());
 }
 
@@ -428,7 +432,6 @@ void GeneralConf::initUploadHistoryMaxSize()
             SIGNAL(valueChanged(int)),
             this,
             SLOT(uploadHistoryMaxSizeChanged(int)));
-
     vboxLayout->addWidget(m_uploadHistoryMaxSize);
 }
 
@@ -437,6 +440,35 @@ void GeneralConf::uploadHistoryMaxSizeChanged(int max)
     ConfigHandler().setUploadHistoryMaxSize(max);
 }
 
+void GeneralConf::initUndoLimit()
+{
+    QGroupBox* box = new QGroupBox(tr("Undo limit"));
+    box->setFlat(true);
+    m_layout->addWidget(box);
+    m_layout->addStretch();
+
+    QVBoxLayout* vboxLayout = new QVBoxLayout();
+    box->setLayout(vboxLayout);
+
+    int limit = ConfigHandler().undoLimit();
+
+    m_undoLimit = new QSpinBox(this);
+    m_undoLimit->setMinimum(1);
+    m_undoLimit->setMaximum(999);
+    m_undoLimit->setValue(limit);
+    QString foreground = this->palette().windowText().color().name();
+    m_undoLimit->setStyleSheet(QStringLiteral("color: %1").arg(foreground));
+
+    connect(m_undoLimit, SIGNAL(valueChanged(int)), this, SLOT(undoLimit(int)));
+
+    vboxLayout->addWidget(m_undoLimit);
+}
+
+void GeneralConf::undoLimit(int limit)
+{
+    ConfigHandler().setUndoLimit(limit);
+}
+
 void GeneralConf::initUseJpgForClipboard()
 {
     m_useJpgForClipboard =