How to toggle the navigation bar when the soft keyboard is showing - OnePlus 6 Themes, Apps, and Mods

You need an application that can detect when the soft keyboard is showing or hidden, for example https://play.google.com/store/apps/details?id=com.jozein.xedgepro
Set the action when then keyboard is shown as running this shell command:
Code:
settings put system buttons_show_on_screen_navkeys 0 && settings put system op_navigation_bar_type 3
This hides the navigation bar and activate the gesture navigation. Note that the
Code:
&&
is part of the shell command.
Set the action when then keyboard is hidden as running this shell command:
Code:
settings put system buttons_show_on_screen_navkeys 1 && settings put system op_navigation_bar_type 1
This shows the navigation bar and disable the gesture navigation.
Both requires root access or maybe the changing system settings permission granted to the application making the change.
Other command:
Code:
settings put system buttons_show_on_screen_navkeys 1 && settings put system op_navigation_bar_type 2
Enable the navigation bar with the hide button.

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thanks, finally a way to disable the navbar
the only problem is that the navbar space is not being used, I have now a black border underneath the keyboard... do you know how to move the keyboard down to the very bottom of the screen?

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Sorry I don't know how to remove the black border you mentioned. I don't have any black border though using oxygenos oreo and gboard.

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so it doesn't look like that for you (see attached screenshot)?

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No, in my case when the keyboard is shown, the navigation bar disappears, and the keyboard move down. Actually it might not be a bad thing because in my case I found it rather annoying that the keyboard move down a little just when I am going to press a letter.

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Tasker profile to show the navbar on any orientation other than portait orientation and revert to gesture navigation on portrait orientation - because using the gesture navigation in other than the portrait orientation is difficult.
Code:
<TaskerData sr="" dvi="1" tv="5.5">
<Profile sr="prof19" ve="2">
<cdate>1539321784266</cdate>
<edate>1539322145574</edate>
<id>19</id>
<mid0>5</mid0>
<mid1>8</mid1>
<nme>Auto NavBar</nme>
<State sr="con0" ve="2">
<code>122</code>
<Int sr="arg0" val="0"/>
</State>
</Profile>
<Task sr="task5">
<cdate>1539312802034</cdate>
<edate>1539322025410</edate>
<id>5</id>
<nme>Portrait</nme>
<Action sr="act0" ve="7">
<code>348</code>
<Int sr="arg0" val="1"/>
<Str sr="arg1" ve="3"/>
<Str sr="arg2" ve="3">%orientation</Str>
</Action>
<Action sr="act1" ve="7">
<code>548</code>
<Str sr="arg0" ve="3">%orientation</Str>
<Int sr="arg1" val="0"/>
</Action>
<Action sr="act2" ve="7">
<code>123</code>
<Str sr="arg0" ve="3">settings put system buttons_show_on_screen_navkeys 0 && settings put system op_navigation_bar_type 3</Str>
<Int sr="arg1" val="0"/>
<Int sr="arg2" val="1"/>
<Str sr="arg3" ve="3"/>
<Str sr="arg4" ve="3"/>
<Str sr="arg5" ve="3"/>
<ConditionList sr="if">
<Condition sr="c0" ve="3">
<lhs>%orientation</lhs>
<op>0</op>
<rhs>portrait</rhs>
</Condition>
</ConditionList>
</Action>
<Action sr="act3" ve="7">
<code>123</code>
<Str sr="arg0" ve="3">settings put system buttons_show_on_screen_navkeys 1 && settings put system op_navigation_bar_type 1</Str>
<Int sr="arg1" val="0"/>
<Int sr="arg2" val="1"/>
<Str sr="arg3" ve="3"/>
<Str sr="arg4" ve="3"/>
<Str sr="arg5" ve="3"/>
<ConditionList sr="if">
<Condition sr="c0" ve="3">
<lhs>%orientation</lhs>
<op>0</op>
<rhs>portrait-reverse</rhs>
</Condition>
</ConditionList>
</Action>
</Task>
<Task sr="task8">
<cdate>1539313091775</cdate>
<edate>1539322045807</edate>
<id>8</id>
<nme>Landscape</nme>
<pri>1006</pri>
<Action sr="act0" ve="7">
<code>123</code>
<Str sr="arg0" ve="3">settings put system buttons_show_on_screen_navkeys 1 && settings put system op_navigation_bar_type 1</Str>
<Int sr="arg1" val="0"/>
<Int sr="arg2" val="1"/>
<Str sr="arg3" ve="3"/>
<Str sr="arg4" ve="3"/>
<Str sr="arg5" ve="3"/>
</Action>
</Task>
</TaskerData>