Qt Designer: Enable reset property for multiselection.

When working with a multiselection in the property editor, the reset
button was previously only enabled when the property was modified on
the selected/current widget. With this change, reset will always be
enabled when the property is modified in one of the widgets of
a multiselection. Unmodified widgets will be filtered out when
initializing the command.

The intended use case is mainly to enable conveniently clearing all
minimumSize/maximumSize constraints of a form by doing Ctrl+A
to select all and then do reset on the property.

Change-Id: Ideab87cab79e9404941d5594653f12c13515c1ae
Reviewed-by: Jarek Kobus <jaroslaw.kobus@theqtcompany.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/src/designer/src/lib/shared/qdesigner_propertycommand.cpp b/src/designer/src/lib/shared/qdesigner_propertycommand.cpp
index 8feb13e42..2103b6cbd 100644
--- a/src/designer/src/lib/shared/qdesigner_propertycommand.cpp
+++ b/src/designer/src/lib/shared/qdesigner_propertycommand.cpp
@@ -1317,7 +1317,19 @@ bool ResetPropertyCommand::init(QObject *object, const QString &apropertyName)
 
 bool ResetPropertyCommand::init(const ObjectList &list, const QString &apropertyName, QObject *referenceObject)
 {
-    if (!initList(list, apropertyName, referenceObject))
+    ObjectList modifiedList = list; // filter out modified properties
+    for (ObjectList::iterator it = modifiedList.begin(); it != modifiedList.end() ; ) {
+        QDesignerPropertySheetExtension* sheet = propertySheet(*it);
+        Q_ASSERT(sheet);
+        const int index = sheet->indexOf(apropertyName);
+        if (index == -1 || !sheet->isChanged(index))
+            it = modifiedList.erase(it);
+        else
+            ++it;
+    }
+    if (!modifiedList.contains(referenceObject))
+        referenceObject = Q_NULLPTR;
+    if (modifiedList.isEmpty() || !initList(modifiedList, apropertyName, referenceObject))
         return false;
 
     if(debugPropertyCommands)