a051be8585
Fixes https://github.com/flutter/devtools/issues/8155 Previously after enabling Widget Selection mode from DevTools and selecting a widget to inspect, a user would then have to click the on-device "Select widget" button before being able to select another widget. This was very confusing to users; we got multiple comments on our latest DevTools Survey that widget selection mode only worked the first time and was broken on subsequent selections. Now, once "Select widget mode" is enabled from DevTools, any subsequent click is treated as a selection until the user exits from select widget mode either via DevTools or via the Exit Selection mode button. The user can re-position the Exit Selection button to either the left or the right of their device (this way they can select a widget beneath it).  Note: Previously this button was behind any widget selection overlays. This PR also updates the order of the `Stack` so that exit selection button is on top.
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