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LibGUI: Support merging of adjacent commands on the UndoStack
When pushing a new command on an undo stack, we will now attempt to merge it into the stack's current command. Merging is implemented by overriding the "merge_with(Command const&)" virtual on GUI::Command. :^)
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2 changed files with 8 additions and 0 deletions
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@ -77,6 +77,12 @@ void UndoStack::push(NonnullOwnPtr<Command>&& command)
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finalize_current_combo();
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}
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if (!m_stack.last().commands.is_empty()) {
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bool merged = m_stack.last().commands.last().merge_with(*command);
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if (merged)
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return;
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}
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m_stack.last().commands.append(move(command));
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if (on_state_change)
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