Created attachment 142344 [details] Change Speed dialog with minimum speed error SUMMARY When a clip has another clip immediately after it and you open the Change Speed dialog, the Down button on the spinner is disabled and entering a new number lower than the current value automatically reverts it to the old value, but doesn't show an error. When sliding the slider down, you get the warning that the "Minimum speed is X" but it doesn't explain why. Ideally this error should show up after typing a number manually too, and it should state the reason why the speed cannot be reduced i.e. adjacent clip is in the way. While I was first learning to use Kdenlive I came across this issue multiple times and had to find out the cause of the problem by trial and error. Hopefully this change will make things easier for others. See also: bug #378104 STEPS TO REPRODUCE 1. Add a clip to the timeline and set its speed to 120%. 2. Add a second clip immediately after it. 3. Open up the Change Speed dialog of the first clip. 4. Type "100" into the speed box and press Tab. OBSERVED RESULT The speed gets changed back to 120% and no error is shown. EXPECTED RESULT The error should be shown AND the error message should explain that the minimum speed is X because of an adjacent clip in the timeline. ADDITIONAL INFO If you type "100" and press Enter instead, the dialog gets closed but nothing happens, which is also confusing because the user never gets to see the error. I'm not entirely sure how this should be handled. Perhaps keep the dialog open (disable the OK button).