Collapsing the sidebar hides toolbar buttons contained at its top without indicating to the user they are now behind the section selector on the right. This could be solved by wrapping them or displaying an indicator icon when buttons are hidden.
please upload screenshot with arrows and legends to better explain what this report is about. tell your O/S as well.
Created attachment 118020 [details]
sidebar Navigator showing toolbar buttons
Created attachment 118021 [details]
sidebar Navigator hiding toolbar buttons
Created attachment 118022 [details]
sidebar Styles and Formatting showing toolbar buttons
Created attachment 118023 [details]
sidebar Styles and Formatting hiding toolbar buttons
Versions are LibreOffice 4 and 5. Operating systems are Linux and Windows, and surely Mac as well.
thanks 4 screenshots
I confirm the bug under Win8.1 x64 using LibO 18.104.22.168 and LibO 22.214.171.124.alpha1+
Build ID: 7d3fa6bae9f7a755eb2d0ca24bf1afd5f3646bb7
TinderBox: Win-x86@39, Branch:master, Time: 2015-08-09_08:38:08
Locale: it-IT (it_IT)
added to Sidebar META-BUG
Had to read this several times before I realized what your valid concern was.
If you resize the Sidebar Deck, shrinking it, various buttons on the content panels slide out of view. And, there is no visual indicator that the button widgets are hidden. Most noticeable on the Navigator panels.
Optionally, for some content panels, it might be preferred to allow the button widgets to shift attachment (or rescale) to fit available width of a resized deck.
Have adjusted summary and set as enhancement.
Heiko mentions the same thing in bug 92317, "Alternative solutions are wrapping controls or to show a chevron like at the toolbar.", and this same topic was being discussed at the design meeting, though no conclusion was reached.