Reproduction instructions: 1. Make your display 1920x1080 2. Switch your LO UI locale to an RTL one, say Hebrew 3. Start LO Calc 4. Maximize the Window 5. Note the active cell coordinates (and maybe choose some cell to be active) 6. On the menus, choose דפים (i.e. Page), and toggle מימין לשמאל (i.e. Right-to-Left), to switch the sheet direction. 7. Set a cell on a different row and column to be the active cell Expected result: At step (3.), the sheet should be LTR (otherwise change the default direction so that it is, and restart the procedure). Before step (6.), there is a certain number of columns which are fully visible, and (at least on my system) no column which is partially-visible. After step (6.), even if some column becomes partially-visible, it should simply look like the column next to it - empty interior, no special patterns or coloring. Actual result: Step (3.) and before step (6.) - same as expected. After step (6.), * a bit of an additional column is barely-visible, column W (this may or may not be a bug). * The left edge of the visible part of the column W cell, on the row which had the active cell during the switch, has jagged blue coloring, reminiscent of the active cell border coloring - touching the scrollbar. * Other cells in column W, but not all cells, have one or two black dots at the left edge of the cell, touchign the scrollbar - as though some content was being hidden by the scrollbar. Will attach before-and-after screenshots.
Created attachment 201824 [details] Calc 26.2 before-and-after direction switch Seen with: Version: 26.2.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: 7ef1c437f30b0869a5b9fa33809bac2c6665ace3 CPU threads: 4; OS: Linux 6.12; UI render: default; VCL: gtk3 Locale: en-IL (en_IL); UI: en-US Calc: CL threaded
Step (6.) in comment #0 said the direction switch is on the Page menu; it's actually on the Sheet menu, sorry.
To clarify: The fact that a part of another column, the W column, is visible, is not in itself a bug - although it's strange and merits some consideration. The proper bug is the presence of the black dots, and the blue coloring residue on the active cell row, within column W.
Created attachment 201915 [details] Calc 26.2 (smaller window) before direction switch
Created attachment 201916 [details] Calc 26.2 (smaller window) after direction switch, note cells F4, F10:F16 Reproduced with a smaller window.
(In reply to Eyal Rozenberg from comment #0) Simplified reproduction instructions: 1. Switch your LO UI locale to an RTL one, say Arabic or Hebrew 2. Start LO Calc 3. Note the active cell coordinates 4. On the menus, choose דפים (i.e. Sheet or الورقة), and toggle מימין לשמאל (i.e. Right-to-Left, من اليمين لليسار), to switch the sheet direction. 5. Select a cell on a different row to be the active cell and it doesn't matter if another column becomes visible or not, nor if the last visible column only has a small bit of it visible. You should still get this rendering artifact. Same build. I _don't_ see this with other VCLs: qt5, gen.