Unable to Merge Table Cells in Confluence 6.14 using Firefox and IE 11

Summary

Unable to Merge Table Cells in Confluence 6.14 using Firefox and IE 11. This is a bug in the TinyMCE library used by Confluence.

Environment

• Confluence 6.14.x and above
• Firefox 65.0.1 (64-bit)
• Internet Explorer 11

Steps to Reproduce

1. Browse Confluence using Firefox
2. Create a new page and add in a table with multiple rows and columns (eg: 5 x 5)
3. Highlight 2 cells (vertically or horizontally) and click on the "Merge table cells"

Expected Results

The highlighted table cells are merged after clicking the button

Actual Results

Nothing happened
cell merge firefox.mp4

Information

• Highlighting multiple cells from different columns and rows (eg: 2 x 2) will allow the cell merge to work properly
• This means after highlighting multiple cells from different columns and rows and then continue to drag the cursor back to 2 cells, 2 of the cells can be merged in this method (refers to the end of video above)
• This issue is not replicable in Confluence 6.11.2.
• This issue is caused by the Confluence 6.14 Editor Update.

Workaround

1. Edit using another browser (eg: Chrome)
2. For Firefox, refer to the second point in Information above.
3. For IE:
   • Select the cells you want to merge
   • Right-click the merge-button in the editor toolbar
   • Left-click the merge button