I've inherited responsibility for maintaining a custom InfoPath form for a content type in a SharePoint Online task list. I believe all functionality is native to InfoPath.
The form has multiple fields, but after some recent modifications, users have noticed that when focus is on a rich text box, it's not possible to immediately click on a drop-down and change its value. As I've not used this form myself previously, I can't guarantee the accuracy of the user feedback that the functionality has changed.
The rich text boxes all have the 'Enable enhanced rich text content...' checkbox checked in the rich textbox properties menu. The SharePoint columns are all set enhanced rich text.
The behaviour is slightly different depending on the browser used:
- Chrome (Version 91.0.4472.77 (Official Build) (64-bit)) and Edge Chromium (Version 91.0.864.64 (Official build) (64-bit) ) show the entries in the drop down list while the left mouse button is pressed, but do not allow you to select an entry, the highlight never moves and focus returns to the rich text box when the button is released
- Firefox (89.0 64-bit) allows you to change selection successfully while the button is pressed, focus returns to the rich text box when released
- IE (Version 1909 (OS Build 18636.1556) everything works as expected, focus shifts to the drop-down as soon as it's clicked on and entry selection works perfectly
Browser compatibility mode settings make no difference to behaviour.
The issue isn't present on other text type fields.
Is there anything settings wise within SharePoint or InfoPath that is likely to have caused this, or do I have to consign it to the often unresolvable category of 'Browser Issues'?