Revert "Remove KisTool::notifyMdified"
This reverts commit 8ef85fdd. This commit fixes issue with autosave only saving once per manual save. Possibly it also fixes the issue with editing time being way lower than expected. --- Mentioned commit removed sending signal KisImage->notifyModified() by KisFreehandTool. Turned out that signal was important for autosave to work correctly and _possibly_ for counting time spent on the painting. Theoretically this signal should be also sent by strokes, rendering sending signal here redundant (hence the previous commit with "It is not used anymore" message). This requires further investigation and then recommitting these changes after making sure all logic is performed as before. Looks like the course of action with the signal from the Freehand tool was as follows: Freehand Tool sends ModifiedSignal -> Image Signal Router sends sigImageModified() -> KisDocument catches it and calls setModified( undoStackNotEmpty ) -> KisDocument does a lot of logic and then sends modified() Supposedly strokes call KisDocument::setModified(...), at least on master. I can't confirm it because I didn't check the relevant code yet. But if that's true, that should be enough - all relevant logic happens inside this function. On the other hand, practice seems to prove otherwise... BUG:411631
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