Inconsistent behaviour of Back button

[saberraz]

There are several issues with android "back" button...

It is not always consistent with in-app "back" button in the top-left corner of pages:

A: Click on a feature in map, then click again the popup to open "feature" panel, then press Back button
Issue: Nothing happens
Expected: Go back to map panel like when the in-app "back" button is pressed

B: Go to Settings > About and then press Back
Issue: it takes you to the map
Expected: Go back to Settings panel like when the in-app "back" button is pressed

When in "map" panel, android "back" button should have the meaning of going one step back. Cases where this is not correct:

C: Press Record button to go to Record mode, then press Back
Issue: Nothing happens
Expected: recording is canceled as if the Cancel button in toolbar got pressed

D: Press Record button to go to Record mode, then click on survey layer name (light green area) to open a popup with active layer selection, then press Back
Issue: Nothing happens
Expected: it should go back to the Record mode with no switch to the active layer

Finally, there's a bit of random behavior:

E: when in main "map" panel and press android back button, sometimes it works (minimizes the app) and sometimes it does nothing.

[saberraz]

7- When editing a form, select Delete, it comes up with the confirmation window.
Issue: Back button does not do anything
Expected behaviour: Back should take you back to the form

[saberraz]

8- When editing geometry of an existing point (from Edit Form, Edit geometry):
Issue: Back button does not do anything
Expected behaviour: It should leave the geometry as it was and take you back to the form

[saberraz]

9- When editing a date using calendar widget, select a date on the widget but do not press OK, and press Back
Issue: it sets the date according to the selection
Expected behaviour: it should leave the date as it was. There is an OK button to confirm the date. Back button should mean = cancel

[tomasMizera]

Update on point E: app is minimized only when at least one feature was opened, if it was not, back button does not work