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This shit always happens using formeditor when trying to set background, preferredSize etc. And sometimes it put 2 lines in the editor, like this if I in exaple edit a table's preferredSize table.setPreferredSize(new java.awt.Dimension (500,200)); table.setPreferredSize(new java.awt.Dimension (500,100));
Created attachment 13437 [details] IDE LOG
*** This issue has been marked as a duplicate of 35870 ***
duplicate verified - the same exception in ide.log